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Aggregation Control of Robust Water-Soluble Zinc(II) Phthalocyanine-Based Photosensitizers
Takuro Ikeuchi1, John Mack2, Tebello Nyokong2
1Department of Chemistry and Materials, Faculty of Textile Science and Technology, Shinshu University , Ueda 386-8567, Japan.
Abstract:
A water-soluble zinc phthalocyanine (ZnPc) complex with four negatively charged electron-withdrawing sulfonic acid substituents at the nonperipheral positions (α-ZnTSPc) is found to have a high singlet oxygen (1O2) quantum yield and exhibits high photostability. The formation of aggregates is hindered and the highest occupied molecular orbital is significantly stabilized, making α-ZnTSPc potentially suitable for its use as a photosensitizer for photodynamic therapy and photoimmunotherapy. Atomic force microscopy (AFM) reveals that mixtures of the negatively charged α-ZnTSPc complex with a similar positively charged ZnPc were found to result in the self-assembly of one-dimensional accordion-like fibers. Supramolecular fibers can be formed in aqueous solutions through intermolecular electrostatic and donor-acceptor interactions between the two water-soluble ZnPcs.
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